Mobile Base Station Squashed into a Raspberry Pi

A group of wireless experts have managed to cram an entire functioning mobile base station into a tiny $35 Raspberry Pi computer.

The Raspberry Pi is a Linux based module that was originally developed to
encourage children to learn to tinker with programming, but has also lead to a
slew of unexpected uses in M2M deployments and even webservers. Now, it has been
converted to work as a base station.

The engineers at the PA Technology Centre got hold of a Raspberry Pi to see
if they could implement a mobile phone base-station that could run their own
private mobile-phone network.

Setting up the Raspberry Pi in a screened-room facility to ensure they didn't
break any laws on frequency spectrum, they successfully managed to route voice
and SMS traffic through the computer - as well as implement the GSM mobile
phone standard.

The development required hooking up the Raspberry Pi to a radio interface and
hand-optimising some of the software. Then code-optimising the signal
processing.

The development was more a proof-of-concept tied in with a technology
competition the company is running, but it demonstrated the surprising versatility
of the tiny UK developed computer.

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